/*
 * tkScrollbar.c --
 *
 *	This module implements a scrollbar widgets for the Tk toolkit. A
 *	scrollbar displays a slider and two arrows; mouse clicks on features
 *	within the scrollbar cause scrolling commands to be invoked.
 *
 * Copyright (c) 1990-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkScrollbar.c,v 1.8 2005/11/17 10:57:35 dkf Exp $
 */

#include "tkPort.h"
#include "tkScrollbar.h"
#include "default.h"

/*
 * Custom option for handling "-orient"
 */

static Tk_CustomOption orientOption = {
    (Tk_OptionParseProc *) TkOrientParseProc,
    TkOrientPrintProc,
    (ClientData) NULL
};

/*
 * Information used for argv parsing.
 */

Tk_ConfigSpec tkpScrollbarConfigSpecs[] = {
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
	DEF_SCROLLBAR_ACTIVE_BG_COLOR, Tk_Offset(TkScrollbar, activeBorder),
	TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
	DEF_SCROLLBAR_ACTIVE_BG_MONO, Tk_Offset(TkScrollbar, activeBorder),
	TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_RELIEF, "-activerelief", "activeRelief", "Relief",
	DEF_SCROLLBAR_ACTIVE_RELIEF, Tk_Offset(TkScrollbar, activeRelief), 0},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
	DEF_SCROLLBAR_BG_COLOR, Tk_Offset(TkScrollbar, bgBorder),
	TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_BORDER, "-background", "background", "Background",
	DEF_SCROLLBAR_BG_MONO, Tk_Offset(TkScrollbar, bgBorder),
	TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_SYNONYM, "-bd", "borderWidth", NULL, NULL, 0, 0},
    {TK_CONFIG_SYNONYM, "-bg", "background", NULL, NULL, 0, 0},
    {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
	DEF_SCROLLBAR_BORDER_WIDTH, Tk_Offset(TkScrollbar, borderWidth), 0},
    {TK_CONFIG_STRING, "-command", "command", "Command",
	DEF_SCROLLBAR_COMMAND, Tk_Offset(TkScrollbar, command),
	TK_CONFIG_NULL_OK},
    {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
	DEF_SCROLLBAR_CURSOR, Tk_Offset(TkScrollbar, cursor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_PIXELS, "-elementborderwidth", "elementBorderWidth",
	"BorderWidth", DEF_SCROLLBAR_EL_BORDER_WIDTH,
	Tk_Offset(TkScrollbar, elementBorderWidth), 0},
    {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
	"HighlightBackground", DEF_SCROLLBAR_HIGHLIGHT_BG,
	Tk_Offset(TkScrollbar, highlightBgColorPtr), 0},
    {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
	DEF_SCROLLBAR_HIGHLIGHT,
	Tk_Offset(TkScrollbar, highlightColorPtr), 0},
    {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
	"HighlightThickness",
	DEF_SCROLLBAR_HIGHLIGHT_WIDTH, Tk_Offset(TkScrollbar, highlightWidth), 0},
    {TK_CONFIG_BOOLEAN, "-jump", "jump", "Jump",
	DEF_SCROLLBAR_JUMP, Tk_Offset(TkScrollbar, jump), 0},
    {TK_CONFIG_CUSTOM, "-orient", "orient", "Orient",
	DEF_SCROLLBAR_ORIENT, Tk_Offset(TkScrollbar, vertical), 0,
	&orientOption},
    {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
	DEF_SCROLLBAR_RELIEF, Tk_Offset(TkScrollbar, relief), 0},
    {TK_CONFIG_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",
	DEF_SCROLLBAR_REPEAT_DELAY, Tk_Offset(TkScrollbar, repeatDelay), 0},
    {TK_CONFIG_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",
	DEF_SCROLLBAR_REPEAT_INTERVAL, Tk_Offset(TkScrollbar, repeatInterval), 0},
    {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
	DEF_SCROLLBAR_TAKE_FOCUS, Tk_Offset(TkScrollbar, takeFocus),
	TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
	DEF_SCROLLBAR_TROUGH_COLOR, Tk_Offset(TkScrollbar, troughColorPtr),
	TK_CONFIG_COLOR_ONLY},
    {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",
	DEF_SCROLLBAR_TROUGH_MONO, Tk_Offset(TkScrollbar, troughColorPtr),
	TK_CONFIG_MONO_ONLY},
    {TK_CONFIG_PIXELS, "-width", "width", "Width",
	DEF_SCROLLBAR_WIDTH, Tk_Offset(TkScrollbar, width), 0},
    {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0}
};

/*
 * Forward declarations for functions defined later in this file:
 */

static int		ConfigureScrollbar(Tcl_Interp *interp,
			    TkScrollbar *scrollPtr, int argc,
			    CONST char **argv, int flags);
static void		ScrollbarCmdDeletedProc(ClientData clientData);
static int		ScrollbarWidgetCmd(ClientData clientData,
			    Tcl_Interp *, int argc, CONST char **argv);

/*
 *--------------------------------------------------------------
 *
 * Tk_ScrollbarCmd --
 *
 *	This function is invoked to process the "scrollbar" Tcl command. See
 *	the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *--------------------------------------------------------------
 */

int
Tk_ScrollbarCmd(
    ClientData clientData,	/* Main window associated with interpreter. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int argc,			/* Number of arguments. */
    CONST char **argv)		/* Argument strings. */
{
    Tk_Window tkwin = (Tk_Window) clientData;
    register TkScrollbar *scrollPtr;
    Tk_Window newWin;

    if (argc < 2) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " pathName ?options?\"", NULL);
	return TCL_ERROR;
    }

    newWin = Tk_CreateWindowFromPath(interp, tkwin, argv[1], NULL);
    if (newWin == NULL) {
	return TCL_ERROR;
    }

    Tk_SetClass(newWin, "Scrollbar");
    scrollPtr = TkpCreateScrollbar(newWin);

    Tk_SetClassProcs(newWin, &tkpScrollbarProcs, (ClientData) scrollPtr);

    /*
     * Initialize fields that won't be initialized by ConfigureScrollbar, or
     * which ConfigureScrollbar expects to have reasonable values (e.g.
     * resource pointers).
     */

    scrollPtr->tkwin = newWin;
    scrollPtr->display = Tk_Display(newWin);
    scrollPtr->interp = interp;
    scrollPtr->widgetCmd = Tcl_CreateCommand(interp,
	    Tk_PathName(scrollPtr->tkwin), ScrollbarWidgetCmd,
	    (ClientData) scrollPtr, ScrollbarCmdDeletedProc);
    scrollPtr->vertical = 0;
    scrollPtr->width = 0;
    scrollPtr->command = NULL;
    scrollPtr->commandSize = 0;
    scrollPtr->repeatDelay = 0;
    scrollPtr->repeatInterval = 0;
    scrollPtr->borderWidth = 0;
    scrollPtr->bgBorder = NULL;
    scrollPtr->activeBorder = NULL;
    scrollPtr->troughColorPtr = NULL;
    scrollPtr->relief = TK_RELIEF_FLAT;
    scrollPtr->highlightWidth = 0;
    scrollPtr->highlightBgColorPtr = NULL;
    scrollPtr->highlightColorPtr = NULL;
    scrollPtr->inset = 0;
    scrollPtr->elementBorderWidth = -1;
    scrollPtr->arrowLength = 0;
    scrollPtr->sliderFirst = 0;
    scrollPtr->sliderLast = 0;
    scrollPtr->activeField = 0;
    scrollPtr->activeRelief = TK_RELIEF_RAISED;
    scrollPtr->totalUnits = 0;
    scrollPtr->windowUnits = 0;
    scrollPtr->firstUnit = 0;
    scrollPtr->lastUnit = 0;
    scrollPtr->firstFraction = 0.0;
    scrollPtr->lastFraction = 0.0;
    scrollPtr->cursor = None;
    scrollPtr->takeFocus = NULL;
    scrollPtr->flags = 0;

    if (ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, 0) != TCL_OK) {
	Tk_DestroyWindow(scrollPtr->tkwin);
	return TCL_ERROR;
    }

    Tcl_SetResult(interp, Tk_PathName(scrollPtr->tkwin), TCL_STATIC);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ScrollbarWidgetCmd --
 *
 *	This function is invoked to process the Tcl command that corresponds
 *	to a widget managed by this module. See the user documentation for
 *	details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *--------------------------------------------------------------
 */

static int
ScrollbarWidgetCmd(
    ClientData clientData,	/* Information about scrollbar widget. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int argc,			/* Number of arguments. */
    CONST char **argv)		/* Argument strings. */
{
    register TkScrollbar *scrollPtr = (TkScrollbar *) clientData;
    int result = TCL_OK;
    size_t length;
    int c;

    if (argc < 2) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " option ?arg arg ...?\"", NULL);
	return TCL_ERROR;
    }
    Tcl_Preserve((ClientData) scrollPtr);
    c = argv[1][0];
    length = strlen(argv[1]);
    if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)) {
	int oldActiveField;
	if (argc == 2) {
	    switch (scrollPtr->activeField) {
	    case TOP_ARROW:
		Tcl_SetResult(interp, "arrow1", TCL_STATIC);
		break;
	    case SLIDER:
		Tcl_SetResult(interp, "slider", TCL_STATIC);
		break;
	    case BOTTOM_ARROW:
		Tcl_SetResult(interp, "arrow2", TCL_STATIC);
		break;
	    }
	    goto done;
	}
	if (argc != 3) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " activate element\"", NULL);
	    goto error;
	}
	c = argv[2][0];
	length = strlen(argv[2]);
	oldActiveField = scrollPtr->activeField;
	if ((c == 'a') && (strcmp(argv[2], "arrow1") == 0)) {
	    scrollPtr->activeField = TOP_ARROW;
	} else if ((c == 'a') && (strcmp(argv[2], "arrow2") == 0)) {
	    scrollPtr->activeField = BOTTOM_ARROW;
	} else if ((c == 's') && (strncmp(argv[2], "slider", length) == 0)) {
	    scrollPtr->activeField = SLIDER;
	} else {
	    scrollPtr->activeField = OUTSIDE;
	}
	if (oldActiveField != scrollPtr->activeField) {
	    TkScrollbarEventuallyRedraw(scrollPtr);
	}
    } else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
	    && (length >= 2)) {
	if (argc != 3) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " cget option\"",
		    NULL);
	    goto error;
	}
	result = Tk_ConfigureValue(interp, scrollPtr->tkwin,
		tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0);
    } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
	    && (length >= 2)) {
	if (argc == 2) {
	    result = Tk_ConfigureInfo(interp, scrollPtr->tkwin,
		    tkpScrollbarConfigSpecs, (char *) scrollPtr,
		    NULL, 0);
	} else if (argc == 3) {
	    result = Tk_ConfigureInfo(interp, scrollPtr->tkwin,
		    tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0);
	} else {
	    result = ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2,
		    TK_CONFIG_ARGV_ONLY);
	}
    } else if ((c == 'd') && (strncmp(argv[1], "delta", length) == 0)) {
	int xDelta, yDelta, pixels, length;
	double fraction;
	char buf[TCL_DOUBLE_SPACE];

	if (argc != 4) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " delta xDelta yDelta\"", NULL);
	    goto error;
	}
	if ((Tcl_GetInt(interp, argv[2], &xDelta) != TCL_OK)
		|| (Tcl_GetInt(interp, argv[3], &yDelta) != TCL_OK)) {
	    goto error;
	}
	if (scrollPtr->vertical) {
	    pixels = yDelta;
	    length = Tk_Height(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	} else {
	    pixels = xDelta;
	    length = Tk_Width(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	}
	if (length == 0) {
	    fraction = 0.0;
	} else {
	    fraction = ((double) pixels / (double) length);
	}
	sprintf(buf, "%g", fraction);
	Tcl_SetResult(interp, buf, TCL_VOLATILE);
    } else if ((c == 'f') && (strncmp(argv[1], "fraction", length) == 0)) {
	int x, y, pos, length;
	double fraction;
	char buf[TCL_DOUBLE_SPACE];

	if (argc != 4) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " fraction x y\"", NULL);
	    goto error;
	}
	if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
		|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
	    goto error;
	}
	if (scrollPtr->vertical) {
	    pos = y - (scrollPtr->arrowLength + scrollPtr->inset);
	    length = Tk_Height(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	} else {
	    pos = x - (scrollPtr->arrowLength + scrollPtr->inset);
	    length = Tk_Width(scrollPtr->tkwin) - 1
		    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
	}
	if (length == 0) {
	    fraction = 0.0;
	} else {
	    fraction = ((double) pos / (double) length);
	}
	if (fraction < 0) {
	    fraction = 0;
	} else if (fraction > 1.0) {
	    fraction = 1.0;
	}
	sprintf(buf, "%g", fraction);
	Tcl_SetResult(interp, buf, TCL_VOLATILE);
    } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
	if (argc != 2) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " get\"", NULL);
	    goto error;
	}
	if (scrollPtr->flags & NEW_STYLE_COMMANDS) {
	    char first[TCL_DOUBLE_SPACE], last[TCL_DOUBLE_SPACE];

	    Tcl_PrintDouble(interp, scrollPtr->firstFraction, first);
	    Tcl_PrintDouble(interp, scrollPtr->lastFraction, last);
	    Tcl_AppendResult(interp, first, " ", last, NULL);
	} else {
	    char buf[TCL_INTEGER_SPACE * 4];

	    sprintf(buf, "%d %d %d %d", scrollPtr->totalUnits,
		    scrollPtr->windowUnits, scrollPtr->firstUnit,
		    scrollPtr->lastUnit);
	    Tcl_SetResult(interp, buf, TCL_VOLATILE);
	}
    } else if ((c == 'i') && (strncmp(argv[1], "identify", length) == 0)) {
	int x, y, thing;

	if (argc != 4) {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " identify x y\"", NULL);
	    goto error;
	}
	if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)
		|| (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {
	    goto error;
	}
	thing = TkpScrollbarPosition(scrollPtr, x,y);
	switch (thing) {
	case TOP_ARROW:
	    Tcl_SetResult(interp, "arrow1", TCL_STATIC);
	    break;
	case TOP_GAP:
	    Tcl_SetResult(interp, "trough1", TCL_STATIC);
	    break;
	case SLIDER:
	    Tcl_SetResult(interp, "slider", TCL_STATIC);
	    break;
	case BOTTOM_GAP:
	    Tcl_SetResult(interp, "trough2", TCL_STATIC);
	    break;
	case BOTTOM_ARROW:
	    Tcl_SetResult(interp, "arrow2", TCL_STATIC);
	    break;
	}
    } else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
	int totalUnits, windowUnits, firstUnit, lastUnit;

	if (argc == 4) {
	    double first, last;

	    if (Tcl_GetDouble(interp, argv[2], &first) != TCL_OK) {
		goto error;
	    }
	    if (Tcl_GetDouble(interp, argv[3], &last) != TCL_OK) {
		goto error;
	    }
	    if (first < 0) {
		scrollPtr->firstFraction = 0;
	    } else if (first > 1.0) {
		scrollPtr->firstFraction = 1.0;
	    } else {
		scrollPtr->firstFraction = first;
	    }
	    if (last < scrollPtr->firstFraction) {
		scrollPtr->lastFraction = scrollPtr->firstFraction;
	    } else if (last > 1.0) {
		scrollPtr->lastFraction = 1.0;
	    } else {
		scrollPtr->lastFraction = last;
	    }
	    scrollPtr->flags |= NEW_STYLE_COMMANDS;
	} else if (argc == 6) {
	    if (Tcl_GetInt(interp, argv[2], &totalUnits) != TCL_OK) {
		goto error;
	    }
	    if (totalUnits < 0) {
		totalUnits = 0;
	    }
	    if (Tcl_GetInt(interp, argv[3], &windowUnits) != TCL_OK) {
		goto error;
	    }
	    if (windowUnits < 0) {
		windowUnits = 0;
	    }
	    if (Tcl_GetInt(interp, argv[4], &firstUnit) != TCL_OK) {
		goto error;
	    }
	    if (Tcl_GetInt(interp, argv[5], &lastUnit) != TCL_OK) {
		goto error;
	    }
	    if (totalUnits > 0) {
		if (lastUnit < firstUnit) {
		    lastUnit = firstUnit;
		}
	    } else {
		firstUnit = lastUnit = 0;
	    }
	    scrollPtr->totalUnits = totalUnits;
	    scrollPtr->windowUnits = windowUnits;
	    scrollPtr->firstUnit = firstUnit;
	    scrollPtr->lastUnit = lastUnit;
	    if (scrollPtr->totalUnits == 0) {
		scrollPtr->firstFraction = 0.0;
		scrollPtr->lastFraction = 1.0;
	    } else {
		scrollPtr->firstFraction = ((double) firstUnit)/totalUnits;
		scrollPtr->lastFraction = ((double) (lastUnit+1))/totalUnits;
	    }
	    scrollPtr->flags &= ~NEW_STYLE_COMMANDS;
	} else {
	    Tcl_AppendResult(interp, "wrong # args: should be \"",
		    argv[0], " set firstFraction lastFraction\" or \"",
		    argv[0],
		    " set totalUnits windowUnits firstUnit lastUnit\"", NULL);
	    goto error;
	}
	TkpComputeScrollbarGeometry(scrollPtr);
	TkScrollbarEventuallyRedraw(scrollPtr);
    } else {
	Tcl_AppendResult(interp, "bad option \"", argv[1],
		"\": must be activate, cget, configure, delta, fraction, ",
		"get, identify, or set", NULL);
	goto error;
    }

  done:
    Tcl_Release((ClientData) scrollPtr);
    return result;

  error:
    Tcl_Release((ClientData) scrollPtr);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * ConfigureScrollbar --
 *
 *	This function is called to process an argv/argc list, plus the Tk
 *	option database, in order to configure (or reconfigure) a scrollbar
 *	widget.
 *
 * Results:
 *	The return value is a standard Tcl result. If TCL_ERROR is returned,
 *	then the interp's result contains an error message.
 *
 * Side effects:
 *	Configuration information, such as colors, border width, etc. get set
 *	for scrollPtr; old resources get freed, if there were any.
 *
 *----------------------------------------------------------------------
 */

static int
ConfigureScrollbar(
    Tcl_Interp *interp,		/* Used for error reporting. */
    register TkScrollbar *scrollPtr,
				/* Information about widget; may or may not
				 * already have values for some fields. */
    int argc,			/* Number of valid entries in argv. */
    CONST char **argv,		/* Arguments. */
    int flags)			/* Flags to pass to Tk_ConfigureWidget. */
{
    if (Tk_ConfigureWidget(interp, scrollPtr->tkwin, tkpScrollbarConfigSpecs,
	    argc, argv, (char *) scrollPtr, flags) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * A few options need special processing, such as setting the background
     * from a 3-D border.
     */

    if (scrollPtr->command != NULL) {
	scrollPtr->commandSize = strlen(scrollPtr->command);
    } else {
	scrollPtr->commandSize = 0;
    }

    /*
     * Configure platform specific options.
     */

    TkpConfigureScrollbar(scrollPtr);

    /*
     * Register the desired geometry for the window (leave enough space for
     * the two arrows plus a minimum-size slider, plus border around the whole
     * window, if any). Then arrange for the window to be redisplayed.
     */

    TkpComputeScrollbarGeometry(scrollPtr);
    TkScrollbarEventuallyRedraw(scrollPtr);
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * TkScrollbarEventProc --
 *
 *	This function is invoked by the Tk dispatcher for various events on
 *	scrollbars.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	When the window gets deleted, internal structures get cleaned up.
 *	When it gets exposed, it is redisplayed.
 *
 *--------------------------------------------------------------
 */

void
TkScrollbarEventProc(
    ClientData clientData,	/* Information about window. */
    XEvent *eventPtr)		/* Information about event. */
{
    TkScrollbar *scrollPtr = (TkScrollbar *) clientData;

    if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
	TkScrollbarEventuallyRedraw(scrollPtr);
    } else if (eventPtr->type == DestroyNotify) {
	TkpDestroyScrollbar(scrollPtr);
	if (scrollPtr->tkwin != NULL) {
	    scrollPtr->tkwin = NULL;
	    Tcl_DeleteCommandFromToken(scrollPtr->interp,
                    scrollPtr->widgetCmd);
	}
	if (scrollPtr->flags & REDRAW_PENDING) {
	    Tcl_CancelIdleCall(TkpDisplayScrollbar, (ClientData) scrollPtr);
	}
	/*
	 * Free up all the stuff that requires special handling, then let
	 * Tk_FreeOptions handle all the standard option-related stuff.
	 */

	Tk_FreeOptions(tkpScrollbarConfigSpecs, (char *) scrollPtr,
		scrollPtr->display, 0);
	Tcl_EventuallyFree((ClientData) scrollPtr, TCL_DYNAMIC);
    } else if (eventPtr->type == ConfigureNotify) {
	TkpComputeScrollbarGeometry(scrollPtr);
	TkScrollbarEventuallyRedraw(scrollPtr);
    } else if (eventPtr->type == FocusIn) {
	if (eventPtr->xfocus.detail != NotifyInferior) {
	    scrollPtr->flags |= GOT_FOCUS;
	    if (scrollPtr->highlightWidth > 0) {
		TkScrollbarEventuallyRedraw(scrollPtr);
	    }
	}
    } else if (eventPtr->type == FocusOut) {
	if (eventPtr->xfocus.detail != NotifyInferior) {
	    scrollPtr->flags &= ~GOT_FOCUS;
	    if (scrollPtr->highlightWidth > 0) {
		TkScrollbarEventuallyRedraw(scrollPtr);
	    }
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * ScrollbarCmdDeletedProc --
 *
 *	This function is invoked when a widget command is deleted. If the
 *	widget isn't already in the process of being destroyed, this command
 *	destroys it.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The widget is destroyed.
 *
 *----------------------------------------------------------------------
 */

static void
ScrollbarCmdDeletedProc(
    ClientData clientData)	/* Pointer to widget record for widget. */
{
    TkScrollbar *scrollPtr = (TkScrollbar *) clientData;
    Tk_Window tkwin = scrollPtr->tkwin;

    /*
     * This function could be invoked either because the window was destroyed
     * and the command was then deleted (in which case tkwin is NULL) or
     * because the command was deleted, and then this function destroys the
     * widget.
     */

    if (tkwin != NULL) {
	scrollPtr->tkwin = NULL;
	Tk_DestroyWindow(tkwin);
    }
}

/*
 *--------------------------------------------------------------
 *
 * TkScrollbarEventuallyRedraw --
 *
 *	Arrange for one or more of the fields of a scrollbar to be redrawn.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

void
TkScrollbarEventuallyRedraw(
    TkScrollbar *scrollPtr)	/* Information about widget. */
{
    if ((scrollPtr->tkwin == NULL) || (!Tk_IsMapped(scrollPtr->tkwin))) {
	return;
    }
    if ((scrollPtr->flags & REDRAW_PENDING) == 0) {
	Tcl_DoWhenIdle(TkpDisplayScrollbar, (ClientData) scrollPtr);
	scrollPtr->flags |= REDRAW_PENDING;
    }
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */
